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Assessing Polyphenol Components and Antioxidant Activity During Fermented Assam Tea Ball Processing

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Assessing Polyphenol Components and Antioxidant Activity During Fermented Assam Tea Ball Processing sustainability Article Assessing Polyphenol Components and Antioxidant Activity during Fermented Assam Tea Ball Processing Pimpinan Somsong 1,2, Chalat Santivarangkna 3, Pimsiri Tiyayon 1, Chi-Ming Hsieh 4,* and Warangkana Srichamnong 3,* 1 School of Agricultural Resources, Chulalongkorn University, Bangkok 10330, Thailand; [email protected] (P.S.); [email protected] (P.T.) 2 Emerging Process for Food Functionality Design Research Unit, Chulalongkorn University, Bangkok 10330, Thailand 3 Institute of Nutrition, Mahidol University, Salaya, Nakhon Pathom 73170, Thailand; [email protected] 4 International Bachelor Program of Agribusiness, National Chung Hsing University, Taichung 402, Taiwan * Correspondence: [email protected] (C.-M.H.); [email protected] (W.S.); Tel.: +886-42284-0849 (ext. 622) (C.-M.H.); +66-2800-2380 (ext. 316) (W.S.) Received: 9 June 2020; Accepted: 13 July 2020; Published: 21 July 2020 Abstract: Fermented tea is traditionally consumed in many Asian countries. In Thailand, the product is made by anaerobic submerged fermentation of semi-mature tea leaves before being made into a ball form. This study aims to investigate the composition of health-associated bioactive compounds in fermented tea balls made from Camellia sinensis var. assamica, which is naturally grown in the forests of northern Thailand. The processing involves steaming semi-mature tea leaves followed by anaerobic fermentation in 2% NaCl solution (1:5 w/v of tea leaves solution). Levels of catechin (C), epicatechin (EC), epicatechin gallate (ECG), epigallocatechin gallate (EGCG), gallocatechin (GC), flavonols (myricetin, quercetin, and kaempferol), phenolic acids (caffeic acid, chlorogenic acid, coumaric acid, and sinapic acid), total phenolic content, and in vitro antioxidant activity were evaluated in fresh tea leaves, steamed tea leaves, and fermented tea leaves over a period of 60 days’ monitoring. The results indicated that fermented tea balls still contain significant amounts of tea polyphenols, although their processing may result in some loss of most bioactive compounds. The antioxidant activity measured by Ferric Reducing Antioxidant Power (FRAP), 2,2-diphenyl-1-picrylhydrazyl (DPPH), and Oxygen Radical Absorbance Capacity (ORAC) assays also declined as the fermentation time was extended. However, phenolic acids, including caffeic acid and sinapic acid, contrastingly increased during prolonged fermentation by 74.35% and 171.43% from fresh leaves, respectively. Keywords: Assam tea; Camellia sinensis; fermentation; polyphenols; flavonoids; catechins 1. Introduction Assam tea, belonging to Camellia sinensis var. assamica, is one of the major tea varieties produced in many parts of the world. Due to its ability to grow in humid and warm areas, Assam tea is distributed in India, Southern China, and many Southeast Asian countries, including Myanmar, Laos, Vietnam, and Thailand [1]. In northern Thailand, Assam tea is grown as part of a forest, which can be recognized as an agroforestry system. Unlike practice in the tea industry, the tea in those areas is allowed to grow naturally without the use of chemicals or other agricultural practices, such as pruning or soil tillage. The tea tree has become an integral part of community life in that its semi-mature leaves, instead of its tea shoots, are used to make fermented tea balls, locally called “Miang”, and serve as refreshments for Sustainability 2020, 12, 5853; doi:10.3390/su12145853 www.mdpi.com/journal/sustainability Sustainability 2020, 12, 5853 2 of 13 consumption during working hours or when welcoming guests into households. The local people of northern Thailand would nib a bite of Miang and chew until its flavor becomes plain. It is also socioeconomically important, as some local villagers run small household industries for fermented tea and hire people from the neighborhood to work. The processing of fermented tea involves steaming semi-mature tea leaves followed by anaerobically submerged fermentation in a big tank filled with NaCl solution. The addition of NaCl solution is considered a traditional method for fermented tea production in this area of study, as it keeps unwanted bacteria from propagating and adds flavor to the product. The fermentation time can range from approximately two weeks up to several years. The final product has the unique flavor of tea blended with an acidic taste. The main strains of microbes that isolate from the leaves and are characterized are mostly in the Lactobacillus genus [2–4]. Similar fermented tea products can also be found in other countries, such as Laos (Miang), Myanmar (Lahpet), China (Yancha), and Japan (Goishi-cha and Awaban-cha), where it is eaten as an ingredient in food or salad or is brewed as a drink [3,5,6]. Tea leaves are known to contain health-promoting components, which include alkaloids, polyphenols, amino acids, polysaccharides, volatiles, vitamins, lipids, and mineral elements [7,8]. They are well known for being antimicrobial, antiaging, and antioxidant; for lowering blood cholesterol levels; for reducing cardiovascular risk; and for reducing risk of cancers—properties that they owe to their polyphenol components [9,10]. The predominant polyphenols in tea leaves are catechins, which include epigallocatechin gallate (EGCG), epigallocatechin (EGC), epicatechin gallate (ECG), gallocatechin (GC), and epicatechin (EC) [11–15]. Other polyphenols, such as flavonols, including quercetin, kaempferol, and myricetin, as well as their glycosides, are also found in leaves, flowers, and tea products but in lesser amounts than catechins [15,16]. However, these polyphenols can vary greatly according to the manufacturing process. For example, green tea generally contains higher amounts of catechins, especially EGCG, than black tea because of the polymerization and enzymatic oxidation of catechins into theaflavins, thearubigin, and theabrownin [17]. A post-fermented Pu-erh tea contains lower amounts of catechins than other types of tea, but new compounds, such as 8-C N-ethyl-2-pyrrolidinone, are reportedly formed [18]. Unlike other tea products, fermented tea leaves obtained by submerged fermentation are not yet popular. In addition, the reports on anaerobically submerged fermentation of semi-mature tea leaves are still limited. However, they are of interest due to their potential as sources of bioactive compounds, along with the benefits of the conservation of local wisdom and the sustainability of the surrounding environment. Therefore, we aim to investigate the composition of health-associated bioactive compounds in a fermented tea product that was made in a controlled environment. This paper presents the levels of total phenolic and antioxidant activity as well as polyphenol components (including catechins, flavonols, and phenolic acids) that existed during a fermentation period of 60 days. 2. Materials and Methods 2.1. Chemicals and Reagents The standards were of High Performance Liquid Chromatography (HPLC) grade; (+)-catechin ( 99%), (-)-epicatechin ( 98%), (-)-epicatechin gallate ( 98%), (-)-epigallocatechin gallate ≥ ≥ ≥ ( 97%), (-)-gallocatechin ( 98%), caffeic acid ( 98%), chlorogenic acid ( 95%), p-coumaric ≥ ≥ ≥ ≥ acid ( 98%), sinapic acid ( 98%), myricetin ( 96%), quercetin ( 95%), kaempferol ( 97%), ≥ ≥ ≥ ≥ ≥ and 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (Trolox) were purchased from Sigma-Aldrich/Merck. Gallic acid (certified reference material, TraceCERT®) was purchased from Fluka Analytical. 2,4,6-tris(2-pyridyl)-s-triazine (TPTZ, 98%), and Folin–Ciocalteu’s phenol reagent (2N) ≥ and 2,2-diphenyl-1-picrylhydrazyl (DPPH) were purchased from Sigma-Aldrich/Merck. 2,20-Azobis (2-methylpropionamidine) dihydrochloride (AAPH, 98%) was purchased from Acros OrganicTM, Thermo Fisher Scientific. Fluorescein sodium salt (Indicator, 98.5–100.5%) was purchased from Sustainability 2020, 12, 5853 3 of 13 Honeywell Fluka. Formic acid and acetonitrile (HPLC grade) were purchased from Sigma-Aldrich/Merck. All other chemicals and reagents not mentioned were of analytical grade. 2.2. Sample Collection Assam tea shoots and leaves in the semi-mature stage were handpicked from a mountainous area (elevation up to 1000 m asl) of Sakard Tai village, Nan, Thailand. The sample was collected during June 2018, which was during the rainy season, with an average temperature range of approximately 22–30 ◦C. The leaves were kept in a plastic bag and transported to the laboratory in an ice cooler box. Leaves damaged by ice burn were sorted out; only the shoots and leaves in good condition were then freeze-dried or fermented for further analysis. 2.3. Fermentation of Tea Leaves Prior to fermentation, semi-mature tea leaves were placed in a steaming pot in a bundle form (each bundle contained 50 leaves) to simulate traditional processing. They were then steamed under water vapor at 100–105 ◦C for 30 min. The NaCl solution (2%) was added to the steamed sample that was left to cool to room temperature at a ratio 1:5 (w/v) and fermented in a sealed, sterile glass jar under a controlled temperature at 25 ◦C. The fermentation was performed in triplicate. The sample was anaerobically fermented for 60 days, based on economic reasons and consumer taste. The fermented sample was freeze-dried before further analysis. 2.4. Extraction of Phenolic Compounds One gram of freeze-dried powder sample was extracted in 25 mL of 25% ethanol using an ultrasonicator (Vibra cell TM Ultrasonic Liquid Processor, Sonics & Materials, Inc.) at an energy
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